Valve Inspection - Can-Am DS 450 2008 Shop Manual

Section 03 ENGINE
Subsection 07 (CYLINDER HEAD/CYLINDER)
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1. Intake valves 38 mm
2. Exhaust valves 31 mm
Valve Stem Seal Removal
Remove and discard valve stem seal with special
pliers such as the Snap-on valve stem seal pliers
(P/N YA 8230).
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Remove valve spring shim.
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1. Valve stem seal
2. Valve spring shim

Valve Inspection

Valve
Inspect valve surface, check for abnormal stem
wear and bending. If out of specification, replace
by a new one.
104
VALVE OUT OF ROUND
INTAKE AND EXHAUST VALVE
NEW
SERVICE LIMIT
Valve Stem
Measure valve stem in three places using a mi-
crometer.
A. Valves stem diameter
VALVE STEM DIAMETER
INTAKE VALVE
NEW
SERVICE LIMIT
EXHAUST VALVE
NEW
SERVICE LIMIT
Change valve if valve stem is out of specification
or has other damages such as wear or friction sur-
face.
Measure valve guide diameter. Refer to
GUIDE REPLACEMENT PROCEDURE
this section.
Valve Face and Seat
Check valve face and seat for burning, pitting and
other signs of damage. Replace valve or cylinder
head if necessary.
Ensure that valves seat properly. Apply marking
paste to ease checking contact pattern.
NOTE: The location of contact area should be in
center of valve face.
0.005 mm (.0002 in)
0.06 mm (.0024 in)
5.961 to 5.975 mm
(.2347 to .2352 in)
5.950 mm (.2343 in)
5.946 to 5.960 mm
(.2341 to .2346 in)
5.935 mm (.2337 in)
VALVE
further in
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